<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
	    <meta content="width=device-width, initial-scale=1.0, minimum-scale=1.0, maximum-scale=1.0, user-scalable=no" name="viewport">  
		<title></title>
		<style type="text/css">
			html{
				font-size: 62.5%;
			}
			div{
				background: red;
				width: 10rem;
				height: 10rem;
			}
			body{
				font-size: 1.4rem;
			}
			p{
				font-size: 1.4rem;
			}
		</style>
	</head>
	<body>
		<div class="">
			0000
		</div>
		<p>
			62.5%，1rem=10px
		</p>
	</body>
</html>
